2 * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief Generic hooks for various libFirm functions.
23 * @author Michael Beck
33 hook_entry_t *hooks[hook_last];
36 void register_hook(hook_type_t hook, hook_entry_t *entry) {
37 /* check if a hook function is specified. It's a union, so no matter which one */
38 if (! entry->hook._hook_turn_into_id)
41 entry->next = hooks[hook];
45 /* unregister a hook */
46 void unregister_hook(hook_type_t hook, hook_entry_t *entry) {
49 if (hooks[hook] == entry) {
50 hooks[hook] = entry->next;
55 for (p = hooks[hook]; p && p->next != entry; p = p->next);
58 p->next = entry->next;
63 int firm_init_hooks(void) {
64 /* this strange code assures that both functions are available
65 in a shared library even if none of them is called.
66 Meanwhile not needed anymore but ... */
67 return (int)register_hook + (int)unregister_hook;